g_func.cpp

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/*
All original material Copyright (C) 2002-2025 UFO: Alien Invasion.
 
Original file from Quake 2 v3.21: quake2-2.31/game/g_spawn.c
Copyright (C) 1997-2001 Id Software, Inc.
 
This program is free software; you can redistribute it and/or
modify it under the terms of the GNU General Public License
as published by the Free Software Foundation; either version 2
of the License, or (at your option) any later version.
 
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
 
See the GNU General Public License for more details.
 
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
 
*/
 
#include "g_func.h"
#include "g_actor.h"
#include "g_ai.h"
#include "g_match.h"
#include "g_move.h"
#include "g_spawn.h"
#include "g_trigger.h"
#include "g_utils.h"
#include "g_vis.h"

static bool Touch_Breakable (Edict* self, Edict* activator)
{
    if (G_IsActor(activator))
        G_TriggerAddToList(self, activator);
 
    return false;
}
 
static bool Destroy_Breakable (Edict* self)
{
    vec3_t origin;
    const char* model = self->model;
 
    self->absBox.getCenter(origin);
 
    const char* breakSound = nullptr;
    switch (self->material) {
    case MAT_GLASS:
        breakSound = "misc/breakglass+";
        break;
    case MAT_METAL:
        breakSound = "misc/breakmetal+";
        break;
    case MAT_ELECTRICAL:
        breakSound = "misc/breakelectric+";
        break;
    case MAT_WOOD:
        breakSound = "misc/breakwood+";
        break;
    case MAT_MAX:
        break;
    }
 
    /* the HP value is used to decide whether this was a triggered call or a
     * call during a fight - a triggered call will be handled differently in
     * terms of timing and the related particle effects in the client code */
    if (self->HP == 0)
        G_EventModelExplodeTriggered(*self, breakSound);
    else
        G_EventModelExplode(*self, breakSound);
 
    if (self->particle)
        G_SpawnParticle(origin, self->spawnflags, self->particle);
 
    G_TouchEdicts(self, 10.0f);
    linkedList_t* touchedList = self->touchedList;
 
    /* destroy the door trigger */
    if (self->child()) {
        Edict* trigger = self->child();
        /* Remove all activators and reset client actions before removing the trigger */
        linkedList_t* list = trigger->touchedList;
        while (list) {
            linkedList_t* next = list->next;
            Edict* activator = static_cast<Edict*>(list->data);
            G_TriggerRemoveFromList(trigger, activator);
            if (trigger->reset != nullptr)
                trigger->reset(trigger, activator);
            list = next;
        }
        G_FreeEdict(trigger);
    }
 
    /* now we can destroy the edict completely */
    G_FreeEdict(self);
 
    AABB oldAABB;
    gi.GetInlineModelAABB(model, oldAABB);
    GridBox rerouteOldBox;
    rerouteOldBox.set(oldAABB);
    G_RecalcRouting(model, rerouteOldBox);
 
    LIST_Foreach(touchedList, Edict, activator) {
        if (G_IsActor(activator))
            G_ActorFall(activator);
    }
 
    return true;
}
 
static bool Use_Breakable (Edict* self, Edict* activator)
{
    self->HP = 0;
    return Destroy_Breakable(self);
}

void SP_func_breakable (Edict* ent)
{
    ent->classname = "breakable";
    ent->type = ET_BREAKABLE;
 
    ent->flags |= FL_DESTROYABLE;
 
    /* set an inline model */
    gi.SetModel(ent, ent->model);
    ent->solid = SOLID_BSP;
    gi.LinkEdict(ent);
 
    char boxStr[AABB_STRING];
    ent->entBox.asIntString(boxStr, sizeof(boxStr));
    Com_DPrintf(DEBUG_GAME, "func_breakable: model (%s) num: %i %s origin: %i %i %i\n",
            ent->model, ent->mapNum, boxStr,
            (int)ent->origin[0], (int)ent->origin[1], (int)ent->origin[2]);
 
    ent->destroy = Destroy_Breakable;
    ent->use = Use_Breakable;
    ent->setTouch(Touch_Breakable);
}
 
/*
=============================================================================
DOOR FUNCTIONS
=============================================================================
*/

static void Door_SlidingUse (Edict* door)
{
    const bool open = door->doorState == STATE_OPENED;
 
    /* get the movement angle vector - a negative speed value will close the door*/
    vec3_t moveAngles;
    GET_SLIDING_DOOR_SHIFT_VECTOR(door->dir, open ? 1 : -1, moveAngles);
 
    /* get the direction vector from the movement angles that were set on the entity */
    vec3_t moveDir;
    AngleVectors(moveAngles, moveDir, nullptr, nullptr);
    VectorAbs(moveDir);
 
    /* calculate the distance from the movement angles and the entity size. This is the
     * distance the door has to slide to fully open or close */
    const int distance = DotProduct(moveDir, door->size);
 
    /* the door is moved in one step on the server side - lerping is not needed here - so we
     * perform the scalar multiplication with the distance the door must move in order to
     * fully close/open */
    vec3_t distanceVec;
    VectorMul(distance, moveAngles, distanceVec);
 
    /* set the updated position. The bounding boxes that are used for tracing must be
     * shifted when the door state changes. As the mins and maxs of the aabb are absolute
     * world coordinates in the map we have to translate the position by the above
     * calculated movement vector */
    VectorAdd(door->origin, distanceVec, door->origin);                     /* calc new model position */
//  gi.SetInlineModelOrientation(door->model, door->origin, door->angles);  /* move the model out of the way */
}

static bool Door_Use (Edict* door, Edict* activator)
{
    int opening = 1;
 
    if (door->doorState == STATE_CLOSED) {
        door->doorState = STATE_OPENED;
        opening = 1;
    } else if (door->doorState == STATE_OPENED) {
        door->doorState = STATE_CLOSED;
        opening = -1;
    } else {
        return false;
    }
 
    /* remember the old location */
    AABB oldAABB;
    gi.GetInlineModelAABB(door->model, oldAABB);
    GridBox rerouteOldBox;
    rerouteOldBox.set(oldAABB);
 
    /* change rotation and relink */
    if (door->type == ET_DOOR) {
        if (door->dir & DOOR_OPEN_REVERSE)
            opening *= -1;
        door->angles[door->dir & 3] += DOOR_ROTATION_ANGLE * opening;
    } else if (door->type == ET_DOOR_SLIDING) {
        Door_SlidingUse(door);
    }
    gi.LinkEdict(door);
 
    /* maybe the server called this because the door starts opened */
    if (G_MatchIsRunning()) {
        /* let everybody know, that the door moves */
        if (door->doorState == STATE_OPENED)
            G_EventDoorOpen(*door);
        else
            G_EventDoorClose(*door);
        if (Q_strvalid(door->noise)) {
            const playermask_t playerMask = G_GetClosePlayerMask(door->origin, UNIT_SIZE * 10);
            G_EventSpawnSound(playerMask, *door, door->origin, door->noise);
        }
    }
 
    /* Update model orientation */
    gi.SetInlineModelOrientation(door->model, door->origin, door->angles);
    AABB newAabb;
    gi.GetInlineModelAABB(door->model, newAabb);
    GridBox rerouteNewBox;
    rerouteNewBox.set(newAabb);
    Com_DPrintf(DEBUG_GAME, "Server processed door movement.\n");
 
    /* Update path finding table for the new location of the model */
    G_RecalcRouting(door->model, rerouteOldBox);                            /* Update path finding table */
    G_RecalcRouting(door->model, rerouteNewBox);
 
    if (activator && G_IsLivingActor(activator)) {
        /* Check if the player appears/perishes, seen from other teams. */
        G_CheckVis(activator);
 
        /* Calc new vis for the activator. */
        G_CheckVisTeamAll(activator->getTeam(), 0, activator);
    }
 
    return true;
}

static bool Touch_DoorTrigger (Edict* self, Edict* activator)
{
    if (!self->owner())
        return false;
    if (!self->owner()->inuse)
        return false;
    if (!G_IsActor(activator))
        return false;
 
    Actor* actor = makeActor(activator);
    if (G_IsAI(actor)) {
        /* let the ai interact with the door */
        if (self->flags & FL_GROUPSLAVE)
            self = self->groupMaster;
        if (AI_CheckUsingDoor(actor, self->owner()))
            G_ActorUseDoor(actor, self->owner());
        /* we don't want the client action stuff to be send for ai actors */
        return false;
    }
 
    /* prepare for client action */
    G_ActorSetClientAction(actor, self->owner());
    return true;
}

static void Reset_DoorTrigger (Edict* self, Edict* activator)
{
    if (activator->clientAction == self->owner())
        G_ActorSetClientAction(activator, nullptr);
}
 
#define REVERSE     0x00000200

void SP_func_door (Edict* ent)
{
    ent->classname = "door";
    ent->type = ET_DOOR;
    if (!ent->noise)
        ent->noise = "doors/open_close";
 
    /* set an inline model */
    gi.SetModel(ent, ent->model);
    ent->solid = SOLID_BSP;
    gi.LinkEdict(ent);
    ent->doorState = STATE_CLOSED;
    ent->dir = YAW;
 
    if (ent->spawnflags & REVERSE)
        ent->dir |= DOOR_OPEN_REVERSE;
 
    if (ent->HP)
        ent->flags |= FL_DESTROYABLE;
    ent->flags |= FL_CLIENTACTION;
 
    /* spawn the trigger entity */
    Edict* other = G_TriggerSpawn(ent);
    other->setTouch(Touch_DoorTrigger);
    other->reset = Reset_DoorTrigger;
    ent->setChild(other);
 
    G_ActorSetTU(ent, TU_DOOR_ACTION);
    if (!ent->speed)
        ent->speed = 10;
    ent->use = Door_Use;
 
    /* the door should start opened */
    if (ent->spawnflags & FL_TRIGGERED)
        G_UseEdict(ent, nullptr);
 
    ent->destroy = Destroy_Breakable;
}
 
void SP_func_door_sliding (Edict* ent)
{
    ent->classname = "doorsliding";
    ent->type = ET_DOOR_SLIDING;
    if (!ent->noise)
        ent->noise = "doors/slide";
 
    /* set an inline model */
    gi.SetModel(ent, ent->model);
    ent->solid = SOLID_BSP;
    gi.LinkEdict(ent);
 
    if (ent->spawnflags & REVERSE)
        ent->dir |= DOOR_OPEN_REVERSE;
 
    if (ent->HP)
        ent->flags |= FL_DESTROYABLE;
 
    ent->doorState = STATE_CLOSED;
    if (!ent->speed)
        ent->speed = 10;
    ent->use = Door_Use;
 
    ent->destroy = Destroy_Breakable;
}

void SP_func_rotating (Edict* ent)
{
    ent->classname = "rotating";
    ent->type = ET_ROTATING;
 
    /* set an inline model */
    gi.SetModel(ent, ent->model);
    ent->solid = SOLID_BSP;
    gi.LinkEdict(ent);
 
    /* the lower, the faster */
    if (!ent->speed)
        ent->speed = 50;
 
    if (ent->HP)
        ent->flags |= FL_DESTROYABLE;
 
    ent->destroy = Destroy_Breakable;
}